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Träfflista för sökning "WAKA:ref ;lar1:(cth);srt2:(1960-1969)"

Sökning: WAKA:ref > Chalmers tekniska högskola > (1960-1969)

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5.
  • Petersson, Göran, 1941, et al. (författare)
  • Determination of the number and position of methoxyl groups in methylated aldohexoses by mass spectrometry of their trimethylsilyl derivatives.
  • 1968
  • Ingår i: Svensk Papperstidning. ; 71:20, s. 731-738
  • Tidskriftsartikel (refereegranskat)abstract
    • Trimethylsilylation of methylated aldohexopyranoses and mass spectrometry of the mixed derivatives permits a simple determination of the number and location of the methoxyl groups. Advantage is taken of the close analogy between the fragmentation of the mixed derivatives and of fully methylated species. The fragmentation is discussed on the basis of the spectra of twenty species. Spectra of derivatives of hexofuranoses and ethylated hexopyranoses indicate that the method can be applied to these species as well.
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6.
  • Petersson, Göran, 1941, et al. (författare)
  • Determination of the number and position of methoxyl groups in methylated aldopentoses by mass spectrometry of their trimethylsilyl derivatives
  • 1968
  • Ingår i: Svensk Papperstidning. ; 71:3, s. 77-84
  • Tidskriftsartikel (refereegranskat)abstract
    • A close analogy exists between the mass spectrometric fragmentation of fully methylated aldopentopyranoses and trimethylsilyl derivatives of partially methylated aldopentopyranoses. Hence, mass spectrometry of the trimethylsilyl derivatives permits a simple determination of the number and position of methoxyl groups in partially methylated aldopentoses. Reference substances are not necessary for identification. The method is useful in studies of the structure of polysaccharides.
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7.
  • Petersson, Göran, 1941, et al. (författare)
  • Formation of glucopyranosylglycolic acids during the hydrolysis of cellulose
  • 1969
  • Ingår i: Svensk Papperstidning. ; 72:7, s. 222-225
  • Tidskriftsartikel (refereegranskat)abstract
    • A solution of glucose and glycolic acid in hydrochloric acid gives rise to the alpha- and beta forms of glucopyranosylglycolic acid when evaporated. Polymerized glycolic acid is formed as well. These reactions complicate analysis of cellulose degradation materials.
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8.
  • Petersson, Göran, 1941, et al. (författare)
  • Gas chromatographic separation of aldonic acids as trimethylsilyl derivatives
  • 1967
  • Ingår i: Svensk Papperstidning. ; 70:11, s. 371-375
  • Tidskriftsartikel (refereegranskat)abstract
    • The separation of trimethylsilyl derivatives of various aldono-1,4-lactones was studied by gas chromatography on a large number of stationary phases. These lactones which are conveniently prepared by evaporating sample solutions containing aldonic acids in the presence of hydrochloric acid, gave rise to single chromatographic peaks. Under other working conditions e.g. by evaporation in the presence of calcium chloride, three peaks can be recorded for each aldonic acid. These were identified by their mass spectra as the fully trimethylsubstituted derivatives of the 1,4-lactone, 1,5-lactone and the trimethylsilyl ester.
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9.
  • Petersson, Göran, 1941, et al. (författare)
  • Mass spectrometric identification of aldonolactones as trimethylsilyl derivatives
  • 1967
  • Ingår i: Acta Chemica Scandinavica. ; 21:1967, s. 1251-1256
  • Tidskriftsartikel (refereegranskat)abstract
    • Trimethylsilyl ethers of aldonolactones are useful for the identification of aldonic acids by mass spectrometry. Peaks recorded for the molecular ion (M) and for mass M-15 give a reliable determination of the molecular weight. Significant differences exist between 1,4- and 1,5-lactones. All diastereomers studied can be well distinguished from each other.
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10.
  • Petersson, Göran, 1941 (författare)
  • Mass spectrometry of alditols as trimethylsilyl derivatives
  • 1969
  • Ingår i: Tetrahedron. ; 25, s. 4437-4443
  • Tidskriftsartikel (refereegranskat)abstract
    • Trimethylsilyl ethers of alditols with 3, 4, 5 and 6 C atoms were investigated. The mass spectra are unusually clearly correlated with the structures. The predominant fragmentations are cleavages in the carbon chain and rearrangement loss of trimethylsilanol. The spectra are closely related to those of the methyl ethers. A spectrum unambiguously identifies a compound as an alditol and permits the determination of its molecular weight.
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